Husqvarna 555FX Operator's Manual page 16

• Do the safety inspections, maintenance and
servicing that are given in this manual.
• Make sure that all covers, guards, handles and the
cutting equipment are correctly attached and not
damaged.
• Make sure that there are no cracks at the bottom of
the saw blade or grass blade teeth or by the center
hole of the blade. Replace the blade if it is damaged.
• Examine the support flange for cracks. Replace the
support flange if it is damaged.
• Make sure that the locknut cannot be removed by
hand. If you can remove it by hand, it does not lock
the cutting attachment sufficiently and you must
replace it.
• Examine the cutting attachment guard and cutting
attachment for damages or cracks. Replace the
blade guard if it has been hit or if it has cracks.
Fuel
This product has a two-stroke engine.
CAUTION:
result in engine damage. Use a mixture of
gasoline and two-stroke oil.
Premixed fuel
• Use Husqvarna premixed alkylate fuel for best
performance and extension of the engine life. This
fuel contains less harmful chemicals compared to
regular fuel, which decreases harmful exhaust
fumes. The quantity of remains after combustion is
lower with this fuel, which keeps the components of
the engine more clean.
16
Incorrect type of fuel can
To mix fuel
Gasoline
• Use good quality unleaded gasoline with a maximum
of 10% ethanol contents.
CAUTION:
an octane grade less than 90 RON/87
AKI. Use of a lower octane grade can
cause engine knocking, which causes
engine damages.
Two-stroke oil
• For best results and performance use Husqvarna
two-stroke oil.
• If Husqvarna two-stroke oil is not available, use a
two-stroke oil of good quality for air-cooled engines.
Speak to your servicing dealer to select the correct
oil.
CAUTION:
oil for water-cooled outboard engines,
also referred to as outboard oil. Do not
use oil for four-stroke engines.
To mix gasoline and two-stroke oil
Gasoline, liter
5
10
15
20
US gallon
1
2 1/2
5
CAUTION:
the ratio of the mixture drastically when you
mix small quantities of fuel. Measure the
quantity of oil carefully and make sure that
you get the correct mixture.
Do not use gasoline with
Do not use two-stroke
Two-stroke oil,
liter
2% (50:1)
0.10
0.20
0.30
0.40
US fl. oz.
2 ½
6 ½
12 ⅞
Small errors can influence
1346 - 004 - 03.06.2021